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4774b5a2 - UIA handler: load highest supported IUIAutomatoin interface by traversing COM interfaces for CUIAutomation8. Re #8338.

UIA handler: load highest supported IUIAutomatoin interface by traversing COM interfaces for CUIAutomation8. Re #8338. Instead of using a statis list of UIA interfaces (IUIA5 to IUIA2), use CUIAutomation8._com_interfaces_ to retrieve suppoted UIA interfaces. This allows this map to be kept static across newer UIA support routines.